code: def _polygon_to_geo_json(
      polygon,  # type: pyocient._STPolygon
  ) -> Any:
      """
      Converts the pyocient._STPolygon object to a GIS format
      compatible with the Superset visualization toolkit (powered
      by Deck.gl).
  
      :param polygon: the pyocient._STPolygon instance
      :returns: the geoJSON encoding of this polygon
      """
      if len(polygon.exterior) > 0 and len(polygon.holes) == 0:
          if len(polygon.exterior) == 1:
              # The exterior ring contains a single ST_POINT
              point = polygon.exterior[0]
              return _point_to_geo_json(point)
          if polygon.exterior[0] != polygon.exterior[-1]:
              # The exterior ring contains an open ST_LINESTRING
              wkt_linestring = _point_list_to_wkt(polygon.exterior)
              return _wkt_to_geo_json(wkt_linestring)
      # else
      # This is a valid ST_POLYGON
      wkt_polygon = str(polygon)
      return _wkt_to_geo_json(wkt_polygon)
  
imports: import contextlib
  import re
  import threading
  from re import Pattern
  from typing import Any, Callable, List, NamedTuple, Optional
  from flask_babel import gettext
  from sqlalchemy.engine.reflection import Inspector
  from superset.constants import TimeGrain
  from superset.db_engine_specs.base import BaseEngineSpec
  from superset.errors import SupersetErrorType
  from superset.models.core import Database
  from superset.models.sql_lab import Query
label_desc: Use image node_id 6 for calling a global function with example usage: _polygon_to_geo_json(polygon) and returns: _wkt_to_geo_json, _point_to_geo_json, _wkt_to_geo_json